Dosimetrists calculate the dose of radiation. To secure sufficient tumor destruction while sparing the normal tissues, a number of (often) complex treatment plans are developed.
The Medical Dosimetrist Certification Board certifies dosimetrists. Dosimetrists work with the physician and the medical physicist to choose the treatment plan that is best for each patient. A dosimetrist may start as a radiation therapist and become with intensive training a dosimetrist. Others are graduates of dosimetry programs.

The dose limit is the highest value of an applied or allowed radiation exposure. The radiation dose is limited in order to prevent the occurrence of radiation-induced deterministic effects or to limit the probability of radiation-related stochastic effects to an acceptable level.

See also Whole Body Counter, Thermoluminescent Dosimeter, Dosimetrist, Annual Limit On Intake, Committed Effective Dose Equivalent, Computed Tomography Dose Index, Directional Dose Equivalent, Doubling Dose.